<!--
 * @Description: 图形
 * @Author: rendc
 * @Date: 2022-09-23 11:06:04
 * @LastEditors: rendc
 * @LastEditTime: 2022-09-23 11:11:38
-->
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>图形</title>
  <style>
    .one{ 
      border: 1px solid black;
      width: 200px;
      height: 200px;
      border-radius: 50%;
    }
    .two{ 
      border: 1px solid black;
      width: 300px;
      height: 200px;
      border-radius: 50%;
    }
    .three{ 
      border: 30px solid transparent;
      width: 60px;
      height: 60px;
      border-top:30px solid black;
    }
  </style>
</head>
<body>
  <div class="main">
    <div class="one">圆</div>
    <div class="two">椭圆</div>
    <div class="three"></div>
  </div>
</body>
</html>